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Cosmology in non-minimal Yang-Mills/Maxwell theory
Kazuharu Bamba, Shin'ichi Nojiri
We review cosmology in non-minimal Yang-Mills/Maxwell theory, in which the Yang-Mills/electromagnetic field couples to a function of the scalar curvature. We show that power-law in…
Crossing of the phantom divide in modified gravity
Kazuharu Bamba, Chao-Qiang Geng, Shin'ichi Nojiri +1
We reconstruct an explicit model of modified gravity in which a crossing of the phantom divide can be realized. It is shown that the (finite-time) Big Rip singularity appears in th…
Future of the universe in modified gravitational theories: Approaching to the finite-time future singularity
Kazuharu Bamba, Shin'ichi Nojiri, Sergei D. Odintsov
We investigate the future evolution of the dark energy universe in modified gravities including gravity, string-inspired scalar-Gauss-Bonnet and modified Gauss-Bonnet ones,…
Large-scale magnetic fields from inflation due to Chern-Simons-like effective interaction
K. Bamba, C. Q. Geng, S. H. Ho
We discuss the generation of large-scale magnetic fields due to the breaking of the conformal invariance in the electromagnetic field through the -even dimension-six Chern-Sim…
Radiative neutrino mass generation and dark energy
K. Bamba, C. Q. Geng, S. H. Ho
We study the models with radiative neutrino mass generation and explore the relation between the neutrino masses and dark energy. In these models, the pseudo-Nambu-Goldston bosons…
Generic estimates for magnetic fields generated during inflation including Dirac-Born-Infeld theories
Kazuharu Bamba, Nobuyoshi Ohta, Shinji Tsujikawa
We estimate the strength of large-scale magnetic fields produced during inflation in the framework of Dirac-Born-Infeld (DBI) theories. This analysis is sufficiently general in the…